Jarring tool



Sept. 12, 1939.

F. N. OSMUN JARRING TOOL Filed Jan. 21, 1938 2 Sheets-Sheet l Sept. 12, 1939. N, OSMUN 2,172,481

JARRING TOOL Jan. 21, Sh e s s t 2 Patented Sept. 12, 1939 UNITED STATES PATENT OFFIC 2,172,481 I JARRING TOOL Fred N. Osmun, Houston, Tex. Application January 21, 1938, Serial No. 186,041 Claims. (Cl. 25527) This invention relates to a jarring tool. Figure 6 shows a side view, partly in section, of

' the lower end thereof.

Figure '7 shows a side view, partly in section, of the pipe grappling tool similar to, and for the samepurpose as, that shown in- Figure 3.

Figure 8 shows a cross-sectional view taken on theline 8-8 of Figure 6, and

Figure 9 shows a side elevation, partly in section, of the complete tool and grapple illustrating theembodiment shown in Figures 5, 6 and 7.

Referring now more particularly to the drawof the character described a well bore may be jarred 5 ered.

The type of tool herein erly termed an inertia bar for the reason that it whereby pipe stuck in loose and thus recovb r, nd the corresponding impact f a Jar threaded mto the upper end of WhlCh there In one embod ment of th ti th p10- is a gland 2 whose lower end presents an annular ectile, or inertla bar, or hammer, is mounted so impact face 3 a d eXtended through the gland that, when plolected, it will also be caused to there is a tubular mandrel 4 Whose u p r nd s rotate to the end that the member carrying the n t d to an p atin st in 5 by means of impact face will receive the force of the blow so ab e coupling h W d of the as to not only cause a jarring action but a partial 1 8 5 abuts the pp d f e and 2 t m of t mpact recelvlng member, and when the tool is set, as hereinafter referred to, inasmuch as the impact receiving member s conas to P the downward movement of the nected to the stuck pipe in the well the pipe will mandrel h shellbe partly rotated and as a result of successive on h meflde of the shellthere are a plurallty beneath the impact face 3. At the lower end of the anot 181' embodiment the mventlon the vertical ribs 8 which extend out radially from the posing impact ation of the tool and without Figure 1 shows a side elevation, partly in section, showing the upper end of the tool.

Figure 2 shows a side View, partly in section, of the lower end thereof.

Figure 3 shows a side elevation, partly in section, of a grapple adapted to be attached to the lower end of the tool and to engage the stuck pipe.

Figure 4 shows a side view, partly in section, of the complete jarring tool, including the the co-pending grapple.

Figure 5 shows a side view, partly in section, of he upper end of another embodiment of the in- Vention.

the well. The jar, hereinabove described, is more specifreason need not be more specifically herein re- 55 ferred to.

When the jarring tool, illustrated in either embodiment as described, is lowered into the well and the grappling tool is engaged with the stuck pipe an upward pull is exerted through the operating string placing the tool under tension and thereupon the piston II will yield and move downwardly releasing the ribs 8 and permitting them to clear the lower ends of the ribs 1 and thereupon the upper section of the tool will, on elasticity of the operating string, upwardly and the upper ends of strike against the impact face 3 thus suddenly stopping the relative longitudinal movement of said parts and creating a jar, all as described in my said co-pending application for Jar.

It is to be understood, however, that any-type of grappling tool may be used for'engaging the stuck pipe or any conventional type of jar may be substituted for that shown and hereinabove more specifically described.- 7

Incorporated into the operating string the required distance above the coupling 6a there are the inter-connected couplings |1, |8 and incorporated into said string above the coupling l8 there are the inter-connected couplings I9, 20 as shown in Figure 1. That portion oftheoperating string extending on to the ground surface may be connected to the last mentioned coupling 20. There are the wash pipe sections 2|. 22, 23. The lower end of the section 2| is screwed into the coupling |8 and'extends up through the coupling l9 and is I annular packing 24 which surrounds said section 2| and is countersunk into the coupling I9 and is maintained ex,- panded by the gland 2 5 The wash pipe section 22 is screwed into the coupling to and extends up through the coupling H and is surrounded by the packing 26 which is countersunk into the coupling l1 and maintained compressed by the gland 21. The section 23 of the wash pipe is screwed into the upper end of the coupling l4 and extends on up into the coupling Ba and is surrounded by the packing 28 which is maintained expanded by the gland -29 screwed into the upper end of the mandrel 4. A washing fluid may be forced down through the operating string and through said wash pipe and on down through an axial channel through the grappling tool towash out the well or to wash out the upper end of the stuck pipe ahead of the tool. I

It will be noted that the wash pipe sections 2|, '22 are spaced inwardly from the operating string proper and surrounding said wash pipe sections 2|, 22 and normally resting on the ribs 8 will the respective couplings l8 and 6a are the inertia bars, or proje'ctiles 30, 3|. These are tubular in form and are mounted for free movement. a

Whenthe upper ends of the ribs 8 strike the impact face 3, as hereinabove provided, the up-,

ward movement of the upper section of the tool,

that is, of the operating string, will be suddenly stopped. The inertia bars, or the projectiles 30, 3| will move upwardly with the operating string at high speed and when this upward movement of the string is suddenly stopped the momentum of the projectileswill cause them to travel on upwardly striking the opposing lower ends of the couplings H), H, respectively, with great force. The distance between the upper end of the bar 3| and the lower end of the coupling I1, as shown, is greater than'the distance between the upper end of the inertia bar 38 and the lower end'of the cou ling l9 so that these strokes, above referred to, will be delivered sue:

33 and normally resting on the cessively and these successive jars, will in an be transferred to the stuck pipe and will usually be effective to dislodge it so that that a single inertia bar, or proused or a plurality of them if It is obvious jectile, may be desired.

In the embodiment illustrated 9, inclusive, a female tool joint coupling 32 is screwed into the upper end of the coupling 6 and screwed into the upper end of the coupling 32 there is the tubular section 33 of the operating string, The portion of the operating string 34 above is connected to the section 33 by means of a coupling 35 whose lower downwardly facing end is formed into an impact face 36 having a depending lug 31. In this form there is an outside, tubular inertia bar 38 fitted around the section upper end of the female coupling member 32 and whose upper end is normally spaced beneath the impact face 36. The inertia bar, or projectile 38 is connected for a slidable and rotative movement with the section 33 by means of a spiralled spline 39. As shown this spline is spiralled to the right so that upon upward movement of the inertia bar 38 it will rotate to the left. The upper end of the inertia bar 38 is provided with a lug 40 pitched in a direction the opposite of that of the lug 31, The lugs 31, 48 have the opposing contact faces 4|, 42..

Upon release of the jar, shown in Figure 6, and the upward movement of the upper sections of the tool, in response to the elasticity of the operating string and upon contact of the faces 9 with the faces 3 and the sudden stopping of the relative longitudinal movement of said sections Wardly. spline 39 is such that when iner ia b r 3. kes the impact face 36 the face 42 will also, strike against the face 4| with a sudden blow thus creating a jar and also partially rqtating the tool to the left.. This left-hand rotatiQn, will be imparted through the clutch formed by the ribs 1 and 8 to the grapple l5 and thence to the stuck pipe l6 thus imparting a lefthand thrust, or turning movement, to said pipe and a repetition of the operation may either jar the stuck pipe loose or unscrew a joint beneath of the stuck pipe permitting the withdrawal of the unscrewed portion of the stuck pipe from the well.

In order to protect the impact face means have been provided for temporarily trapping a liquid cushion between the impact'face and the oppos-v ing end of the corresponding inertia bar 30 or 3|. For this purpose the lower ends of the couplings |1, |9 are provided with the annular channels 43", 44, as shown in Figure l which diverge, slightly, downwardly. The operating string is provided with openings 45, 46 whereby the well fluid may enter the chambers in which the projectiles or inertia bars are located and'upon projection of. said bars upwardly their upper ends will enter the channels 43, 44 and will temporarily trap the fluid in said channels which will act as cushions to prevent the battering or marring of the upper ends of the inertia bars as well as the impact faces, said entrapped liquid being ultimately permitted to escape by reason of the downward flare of said channels. a The drawings and description disclose what are now consideredcto be preferred. forms of the invention by way of the upper end of the illustration only, while the I broad principle of the invention will be defined by the appended claims.

What I claim is:

1. A jarring tool comprising two relatively movable parts, means for releasably locking said parts against relative longitudinal movement,

said locking means being releasable under the influence of tension on the parts to permit such relative longitudinal movement, means for arresting such relative longitudinal movement to cause a jar, means for connecting one of said parts to a stuck object, an inertia bar, forming a projectile carried by the other part mounted to be projected upon such relative longitudinal movement of said parts and an impact member arranged on said other part to receive the impact of said inertia bar upon such projection.

2. A jarring tool comprising two relatively movable parts, means for releasably locking said parts against relative longitudinal movement, said locking means being releasable under the influence of tension on the parts to permit such relative longitudinal movement, impact receiving members, means arranged to engage one of said impact members, upon release of said looking means, to arrest said longitudinal movement and cause a jar and means arranged to be thereafter projected against the other impact member to cause a jar.

3. A jarring tool comprising two relatively movable parts, means for releasably locking said parts against relative longitudinal movement, said locking means being releasable in the presence of tension on said parts to permit such longitudinal movement, means for arresting such relative longitudinal movement to cause a jar, means for connecting one part to a stuck object, an impact member on the other part and an inertia bar forming a projectile arranged to be projected against said impact member upon the arrest of such relative longitudinal movement of said parts.

4. A jarring tool comprising two relatively movable parts, means for holding said parts against relative longitudinal movement while the tool is under tension and being releasable to permit such longitudinal movement, means for arresting such relative longitudinal movement to cause a jar, means for connecting one part to a stuck object, an impact abutment on the other part and means arranged to be projected against said abutment upon the arrest of such relative longitudinal movement of said parts.

5. A jarring tool comprising a tubular string having two parts and adapted to be placed under tension, means for preventing relative longitudinal movement of said parts, said means being releasable to permit such relative longitudinal movement under the influence of the tension on the string, means for arresting such longitudinal jar, means for connecting one of said parts to a stuck object, an abutment on the other part and a projectile carried by said other part and arranged to be projected against said abutment upon the arrest of such relative longitudinal movement of said parts.

6. In combination an operating string, a jarring tool incorporated into the string, means for connecting the jarring tool to a stuck object, a plurality of impact abutments carried by the string, a plurality of projectiles carried by the string and arranged to be projected against said abutments upon operation of the jarring tool.

7. In combination an operating string, a jarring tool incorporated into the string, means for connecting the jarring tool to a stuck object, a plurality of impact abutments carried by the string, a plurality of projectiles carried by the string and arranged to be projected to impact successively against the respective abutments upon operation of the jarring tool.

8. A jarring tool comprising two relatively movable parts, means for releasably locking said parts against relative longitudinal movement, said locking means being releasable while the tool is under tension to permit such relative longitudinal movement, means for arresting such relative longitudinal movement to cause a jar, means for connecting one part to a stuck object, an impact member on the other part, a body forming a projectile arranged to be projected against said impact member upon the arrest of such relative longitudinal movement of said parts and means for causing rotation of the projectile.

9. A tool of the character described adapted to be placed under tension and comprising two relatively movable parts, means for holding said parts against relative longitudinal movement, said means being releasable while said parts are under tension to permit such longitudinal movement, means for arresting such relative longitudinal movement to cause a jar, a grapple for connecting one of said parts to a stuck object, an impact abutment on the other part and a member arranged to be rotated, and simultaneously projected against said abutment, by the momentum of said member, upon the arrest of such relative longitudinal movement of said parts.

10. A jarring tool comprising a tubular string adapted to be placed under tension, means for connecting the string to a stuck object, an abutment carried by the string, a movable body arranged to be projected against said abutment to create a jar upon release of said tension, said abutment and the opposing end of said body being formed, one with a recess forming a trap for liquid into which the other projects upon operation of the tool.

movement to cause a FRED N. OSMUN. 

